For the price I was skeptical! I thought then on a cheap scrap of not even 10 cents value - but does not register! This taillight exceeds my expectations. Extremely bright, light and easy to assemble without tools. The bright light is already perceived from a distance, so I imagine a security light! I can recommend it, in fact, with a clear conscience! Simply a must for any cycling friend who wants to be seen in time even in the dark! Buy recommendation: buy necessarily !!!